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Cindytrevizo Cindytrevizo
  • 20-05-2015
  • Mathematics
Answered

Find a8 for the geometric series with r=2, s8=1020, and a1=4

Verified Answer :

naǫ
naǫ naǫ
  • 20-05-2015

\(a_1=4 \\ r=2 \\ \\ a_n=a_1 \times r^{n-1} \\ a_8=a_1 \times r^7 \\ a_8=4 \times 2^7 \\ a_8=4 \times 128 \\ \boxed{a_8=512}\)

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